Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec615bb1988416c…

MALICIOUS

PDF

82.7 KB Created: 2021-08-31 11:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0fc1aba9a95269ccd4c7f5738e7e2af7 SHA-1: 61d6e7b1fa6f852d318d1b00427d0ca6706938f5 SHA-256: 5ec615bb1988416c89297ba7d299cb0a77c53d1d83cae8dc8d0262d183506cd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. The primary purpose appears to be directing users to malicious content or further infection vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://stellar.ru/ckfinder/userfiles/files/36437039141.pdf In PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cbc297f40---46639817678.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075eab9928f0---25723992245.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/vamirasazimerimiduvogo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97d14b593---20175752604.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16110270026216---xaxizemesiboso.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/90300527747.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e586f5cf1e---fobimaz.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb3648189---5562952120.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/mekevovogun.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/24749524646.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160706f0b3629b---nugevofidojukesorike.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2eb9febafaf4d7e40905d49ee501a665/47476872206.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/29638623539.pdfIn PDF document text
    • http://hainfelderteich.at/88559957763.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/14792583014.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/tukiwexobirudimatikiruj.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/66932308548.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/nejalivakixumimumadima.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/21165850773.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/59385895670.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/42851569259.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/25868694010.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/ridofovumu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8s8420q51933hg029qr80bobju/86201623440.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccabcf14f39---sagosuwodolevekoxatuderu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=yes+or+no+astrologyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 10288 bytes
SHA-256: 744e57c0086113e8d2a3b397b07aebe3758b3f7b7636bfa7ed3ba40c57f42bd3
font_01_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11239 16588 bytes
SHA-256: 9a2612ba45a1bbd108ed63b93b5b2c5a9fc5d2e27d8f20b1732869da2bfc0dbc